Transformer Multiple Choice Questions and Answers

11. A transformer core is laminated to.......

   A.Reduce hysteresis loss

   B.Reduce eddy current loss

   C.Reduce copper loss

   D.Reduce all above losses

12. The no-load current drawn by transformer is usually........

   A.0.2% to 0.5%

   B.2% to 5%

   C.12% to 15%

   D.20% to 30%

13. No-load on a transformer is carried out to determine........

   A.Copper lossα

   B.Magnetising currentα

   C.Magnetising current and lossα

   D.Efficiency of the transformerα

14. Sumpner's test is conducted on transformers to determine........

   A.Temperature

   B.Stray loss

   C.All-day efficiency

   D.All of the above

15. No-load current in a transformer........

   A.Lags behind the voltage by about 75⁰

   A.Lags behind the voltage by about 15⁰

   C.Leads the voltage by about 75⁰

   D.Leads the voltage by about 15⁰

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